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MIL-STD 1553 Triggering Hardwarebased Decode (Option 553) Agilent's InfiniiVision Series Oscilloscopes
Debug physical layer characteristics your MIL-STD 1553 faster
differential 1-Mbs MIL-STD 1553 serial widely used today broad range aerospace/defense systems including aircraft avionics equipment, space-based systems, well many ground-based military vehicles. until now, capturing measuring electrical characteristics MIL-STD 1553 signals been difficult tedious process using conventional analog digital oscilloscope. Setting scope trigger synchronize specific transmitted words often required external synchronization signal guessing specific trigger hold-off setting. then determine contents captured displayed communication packet/word required commonly used visual "bit-counting" technique, which slow prone errors. those days over. Agilent Technologies InfiniiVision Series oscilloscopes offers integrated MIL-STD 1553 serial triggering, hardware-based decoding, eye-diagram mask testing help debug characterize electrical/physical layer MIL-STD 1553 serial buses.
Features Hardware-based decoding Command/Status Data Words helps find
Trigger specific Command/Status Words, Data Words, error conditions. Perform hardware-based pass/fail MIL-STD 1553 mask testing test
analog quality your network. Capture more consecutive decoded 1553 Words using Segmented Memory acquisition Automatically perform parametric measurements with statistics compare against published MIL-STD 1553 electrical specifications. Make physical layer measurements field with only oscilloscope MIL-STD 1553 applications with optional battery operation.
Time-correlate MIL-STD 1553 protocol decoding with physical layer waveforms
With Option your Agilent InfiniiVision series oscilloscope N5469A after-purchase upgrades), view MIL-STD 1553 protocol decoded communication time-correlated with your physical layer signals. with Agilent's unique hardware-based protocol decoding, which provides fastest decode update rates oscilloscope industry, scope capture decode 100,000 waveforms second. only does fast waveform decode update rates enhance usability scope, most importantly improves scopes probability capturing random infrequent communication errors. Figure shows example scope capturing displaying MIL-STD 1553 communication between Controller (BC) Remote Terminal (RT). decode trace bottom display, which time-correlated with captured waveform just above (yellow trace), shows decoded Command Word followed Status Word response color-coded green. Following Status Word beginning stream Data Words transmitted upper half scope's display shows scope's protocol "lister" display. This display shows "big picture" MIL-STD 1553 protocol communication that occurs both before after trigger event. with Agilent's 7000B series scopes, also easily Search Navigate within lister display find particular events interest with direct time-correlation waveform display.
Figure Time-correlated display MIL-STD 1553 physical layer signal with protocol decoding.
Flexible MIL-STD 1553 Triggering
With Option your Agilent InfiniiVision series oscilloscopes, have wide range triggering possibilities help zero-in specific MIL-STD 1553 communication transactions shown Figure following triggering conditions supported: Data Word Start Data Word Stop Command/Status Word Start Command/Status Word Stop Remote Terminal Address Remote Terminal Address Bits Parity Error Sync Error Manchester Error
Figure Trigger specific MIL-STD 1553 communication words errors.
uniquely trigger specific Command Status Words, "Remote Terminal Address Bits" triggering mode used. Bits" refers times through which bits that follow remote terminal address (RTA) field. example, triggering specific Command Word usually accomplished specifying format, then transmit/ receive plus sub-address binary format. Figure shows example triggering Command Word with 15dec (0FHEX), transmit/receive high, with sub-address equal 17dec 10001 XXXXX). With this combination "RTA Bit" triggering, scope triggers desired Command Word that requesting data from specific remote terminal. this case, that Status Word from remote terminal (RT) follows this particular Command Word expected.
Figure Triggering Command Word with transmit data instruction.
Flexible MIL-STD 1553 Triggering (continued)
Figure shows similar triggering example. this time transmit/receive (bit time been 10001 XXXXX). that after "receive" instruction sent, Data Word sent Controller (BC) follows Command Word expected.
addition triggering specific Command Status Words, Agilent InfiniiVision series scopes trigger error conditions including sync errors, Manchester encoding errors, parity errors. Figure shows example scope setup trigger Manchester encoding error. Using this trigger condition catch errors, that Status Word that should responding Command Word (RTA: sent been severely corrupted.
Figure Triggering Command Word with receive data instruction.
Figure MIL-STD 1553 error triggering helps uncover signal integrity problems.
MIL-STD 1553 Eye-diagram Mask Testing
With addition Agilent's mask testing option (Option LMT) your InfiniiVision series oscilloscope, also perform automatic pass/fail eye-diagram mask tests your MIL-STD 1553 serial bus. Eye-diagram testing used broad range today's serial applications. eyediagram basically overlay digitized bits that shows when bits valid. This provides composite picture quality system's physical layer characteristics, which includes amplitude variations transmission line affects, reflections, system noise, over-shoot, ringing, signal edge placement shift, jitter. Figure shows MIL-STD 1553 eye-diagram mask test input remote terminal (RT). scope repetitively captures overlays Manchester-encoded bits every Data Word received input test points specific remote terminal. Notice that some lower amplitude signals received input this remote terminal failing mask test. This indicated waveform areas highlighted that cross through pass/fail mask. Although mask limit standards/specifications have been established MIL-STD 1553 differential signals, Agilent created diamond-shaped polygon mask limits based existing zero-crossing-distortion input specification minimum voltage swing input specification transformer-coupled systems direct-coupled systems. Since MIL-STD 1553 serial based Manchester bi-phase encoded data transmission, there actually "eyes" separate masks each shown Figure With this type data encoding, signal edge transitions should occur near point each field times through should never signal remain high remain extending across this pair half-bit masks. Since 3-bit synchronization field does adhere Manchester encoding, these particular bits each word tested. addition performing system eye-diagram mask testing every received Data Word, Agilent provides variety MIL-STD 1553 mask files testing specific Command Status Word transmissions received different input test points your system. Figure shows example testing Command Words transmitted from Controller received Remote Terminal with equal 0FHEX. following mask files downloaded from Agilent's website charge
Figure system eye-diagram mask test transmission coupled system input remote terminal.
Figure 0FHEX transformer-coupled input mask test.
System xfmr-coupled Input.msk System direct-coupled Input.msk xfmr-coupled Input.msk direct-coupled Input.msk xfmr-coupled Input.msk direct-coupled Input.msk xfmr-coupled Input.msk direct-coupled Input.msk
MIL-STD 1553 Eye-diagram Mask Testing (continued)
Agilent's InfiniiVision series oscilloscope mask testing only hardware-based mask testing oscilloscope industry. This produces industry's fastest mask testing with test rates 100,000 waveforms tested second. With test rates this fast scope quickly uncover very infrequent anomalies provide detailed pass/fail statistics, including Sigma quality report. addition, have ability customize your testing based variety test criteria including: Test continuously Test until error detected Test until user-specified number tests been satisfied Test until user-specified test time been satisfied Test until user-specified potential Sigma quality been satisfied Figure shows example "Stop-on-error" mask test while testing Command Status Words with 0FHEX. first mask violation occurred after testing over 1,300 bits. this example what appears Manchester encoding error. After acquisitions have been stopped this mask violation, then re-scale timebase effectively "unfold" order observe each last captured Status Word that produced mask violation shown Figure that appears that signal transitions during this word were shifted. only scope catch this timing error using mask testing, also detected decoded Manchester encoding error.
Figure "Unfolding" reveals that bits within this Status Word have transition shifts that produces Manchester encoding error.
Figure "stop-on-error" mask test uncovers shift error.
Segmented Memory acquisition captures stores more MIL-STD 1553 words
Segmented Memory acquisition option (Option SGM) Agilent's InfiniiVision Series oscilloscopes optimize your scope's acquisition memory, allowing capture more MIL-STD 1553 Command, Status, Data Words while using less memory. Segmented memory acquisition optimizes number MIL-STD 1553 words that captured consecutively selectively ignoring (not digitizing) unimportant idle time between words. with minimum picoseconds time-tagging resolution, will know precise time between each captured word. Figure shows MIL-STD 1553 measurement with scope trigger Status Words with 0FHEX. Using this trigger condition with segmented memory acquisition mode turned scope easily captures 2000 consecutive occurrences this word total acquisition time seconds. After acquiring 2000 Status Words, then scroll through words individually look anomalies errors. Agilent's InfiniiVision Series oscilloscopes only scopes market today that capture, store, decode MIL-STD 1553 communication traffic using Segmented Memory acquisition.
Figure Segmented Memory acquisition captures 2000 consecutive 1553 words with precise time-tagging.
Measure electrical characteristics MIL-STD 1553 based published specifications
With InfiniiVision scope's built-in parametric measurements, it's easy measure voltage swings transition times your signals then compare them MIL-STD 1553 input output electrical specifications. Also included comprehensive measurement statistics each selected measurement including min, max, mean, standard deviation shown Figure
Figure Automatic parametric measurements with statistics makes easy test electrical characteristics MIL-STD 1553 signals against published specifications.
Probe MIL-STD 1553 signals with precision
Signal integrity measurements differential MIL-STD 1553 signals require precision differential active probing. Agilent offers wide range differential active probes various bandwidth dynamic range applications. most MILSTD 1553 testing, Agilent recommends N2791A 25-MHz, differential active probe. This probe measure signals peak when used 10:1 attenuation setting, peak when used 100:1 attenuation setting.
Figure Agilent recommends N2791A 25-MHz differential active probe MIL-STD 1553 applications.
Make MIL-STD 1553 measurements field under battery operation
Agilent 6000 Series oscilloscopes provide optional internal rechargeable lithium battery that will enable hours without line power. Option 6000 Series scopes specifically designed applications where line power available when handheld scopemeter lacks needed measurement capability MIL-STD 1553 applications. Agilent 6000 Series oscilloscopes offer only high-performance scope bandwidth) with battery option market.
Figure Agilent's 6000 Series oscilloscopes available with battery option remote/field testing MIL-STD 1553 applications.
Operating Characteristics Ordering Information
Characteristics Option N5469A
MIL-Std 1553 Input Source Triggering Analog channels (using differential active probe) Data Word Start Data Word Stop Command/Status Word Start Command/Status Word Stop Remote Terminal Address (hex) Remote Terminal Address (hex) Bits (hex Binary) Parity Error Sync Error Manchester Error Base: Binary Command Status Word ("C/S" green) Remote Terminal Address (hex binary digits green) Bits following (hex binary digits green) Data Word ("D" white) Data Word Bits (hex binary digits white) Parity Error (entire decoded word red) Synchronization Error ("Sync" red) Manchester Error ("Manch" red)
Color-coded, hardware-accelerated decode
MIL-STD 1553 trigger decode option compatible with 4-channel 4+16 channel Agilent InfiniiVision Series oscilloscopes (5000, 6000, 7000 series scopes). This option available factory-installed option ordered Option-553 along with specific oscilloscope model. Existing InfiniiVision Series oscilloscope owners upgrade their scopes with this option ordered N5469A.
Option number factory installed
Model number Description user installed
N5469A N5455A N5454A N2791A MIL-STD 1553 triggering decode 4+16 channel models only) Mask test option Segmented Memory acquisition option 25-MHz differential active probe
Note that additional options accessories available Agilent InfiniiVision Series oscilloscopes. Refer appropriate 5000, 6000, 7000 Series data sheet ordering information about these additional options accessories, well ordering information specific oscilloscope models.
Related Agilent literature
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